| 引用本文: | 孙晓惠,李钊,李子然.轮胎胶料压延过程数值模拟[J].材料科学与工艺,2019,27(1):91-96.DOI:10.11951/j.issn.1005-0299.20180046. |
| SUN Xiaohui,LI Zhao,LI Ziran.Numerical simulation of the calendaring process of tire compound[J].Materials Science and Technology,2019,27(1):91-96.DOI:10.11951/j.issn.1005-0299.20180046. |
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| 摘要: |
| 为研究轮胎胶料压延过程中的流动和变形，本文建立了胶料压延过程的二维有限元模型，分别采用Bird-Carreau (BC)模型和五模态Phan-Thien-Tanner(PTT)模型对胶料的纯黏性和黏弹性行为进行了表征.提出了根据流场分布差异来确定黏弹性流体压延分离点的方法，即假设不同分离点位置进行计算，当假设分离点处的速度矢量与压延方向(水平方向)一致时，该点即为实际分离点.利用Polyflow软件对压延过程进行了数值模拟，在此基础上进一步研究了辊筒转速对胶料厚度比的影响.结果表明：采用五模态PTT模型获得的胶料厚度比与实际测量值基本吻合，而采用BC模型的计算值则差异较大，这一方面表明了本文数值模型的有效性，另一方面也表明了压延过程模拟必须计及胶料的弹性；胶料厚度比在低辊速下随着辊速增加而迅速增大，在较高辊速时则趋于稳定，这也与现场实测结果一致. |
| 关键词: 压延 胶料 数值模拟 厚度比 分离点 |
| DOI：10.11951/j.issn.1005-0299.20180046 |
| 分类号:TQ33 |
| 文献标识码:A |
| 基金项目:中央高校基本科研业务费专项资金资助(WK2090050018,WK2480000004). |
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| Numerical simulation of the calendaring process of tire compound |
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SUN Xiaohui1,2, LI Zhao1,2, LI Ziran1,2
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(1. Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China; 2.CAS Key Laboratory of Mechanical Behavior and Design of Materials (University of Science and Technology of China), Hefei 230026,China)
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| Abstract: |
| To investigate the fluxion and deformation of tire compound in calendaring process, a 2D finite element model was established. The rheological property of rubber was characterized by a Bird-Carreau(BC) model and a 5-mode Phan-Thien-Tanner(PTT)model to describe its pure viscosity and viscoelasticity. To determine the separation point of viscoelastic fluid, a method based on the difference of flow field distribution at different separation points was proposed.To be specific, a number of calculations were carried out with different assumed separation points and the resulting separation point was determined when the velocity vector was consistent with the calendaring direction (horizontal direction). Based on the foregoing model, the calendaring process was simulated by Polyflow. Results show that the rubber thickness ratio agreed well with the experimental data by using 5-mode PTT model, while the simulation result was greatly different by using the BC model, which indicates the validity of the simulated model and suggests that the rubber elasticity must be considered in calendaring simulation. In addition, the relationship between the thickness ratio and the circumferential speed of the rolls was further investigated. When the roller speed was low, the rubber thickness ratio increased rapidly with the increase of the roller speed, while when the roller speed was high, the rubber thickness reached a stability value, which is consistent with the practical measurement. |
| Key words: calendaring rubber compound numerical simulation thickness ratio separation point |
